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MathGroup Archive 2007

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Re: Sorting by date

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72674] Re: [mg72637] Sorting by date
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 14 Jan 2007 05:22:58 -0500 (EST)
  • Reply-to: hanlonr at cox.net

data={{3,137.5,13978,{2005,2,8}},
      {3,138.5,12519,{2005,1,4}},
      {3,171.9,15835,{2005,4,12}},
      {3,142.8,17137,{2005,11,19}},
      {3,161.1,18881,{2006,1,18}},
      {3,108.7,20055,{2006,2,28}},
      {3,157,21498,{2006,9,14}},
      {3,118.1,10891,{2004,11,12}}};

Sort[data, Last[#1].(10^{4,2,1})<Last[#2].(10^{4,2,1})&]

{{3,118.1,10891,{2004,11,12}},{3,138.5,12519,{2005,1,4}},{3,
  137.5,13978,{2005,
    2,8}},{3,171.9,15835,{2005,4,12}},{3,142.8,17137,{2005,11,19}},{3,
    161.1,18881,{2006,1,18}},{3,108.7,20055,{2006,2,28}},{
    3,157,21498,{2006,9,14}}}


Bob Hanlon

---- Clifford Martin <camartin at snet.net> wrote: 
> Hi All,
> 
> I have a list of lists that looks like so:
> 
> 
> {{3, 137.5, 13978, {2005, 2, 8}}, {3, 138.5, 12519, {2005, 1, 4}}, {3, 171.9, 15835, {2005, 4, 12}}, {3, 142.8, 17137, {2005, 11, 19}}, 
>   {3, 161.1, 18881, {2006, 1, 18}}, {3, 108.7, 20055, {2006, 2, 28}}, {3, 157, 21498, {2006, 9, 14}}, {3, 118.1, 10891, {2004, 11, 12}}}
> 
> The last element per vector is a date. I'd like to sort the list so that the vectors are arranged in ascending order of date, i.e. the vector containing {2004,11,12}  should be first and and the vector containing {2006,9,14}  should be last. Any help would be appreciated.
> 
> Thanks
> 
> Cliff
> 


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